ACE,
Thanks for the extra PICS, I am surprised the 4L60 fit without a ton of mods, I thought I was gonna have to destroy my floor to do one (I considered it at one point) so I stuck with my old 727. Looks good. My buddy used to have a 67 valiant in white, I like those cars. Keep up the quality work...
You mentioned manual steering, the flaming river box with a 16:1 ratio is a PITA for a daily in my mind, it's great once moving, but hell in a parking lot. The factory box is 24:1 a bit sluggish, but comfortable for low speeds. You may keep you eyes peeled for a 20:1 Worm gear for a rebuild. MOPAR made them a while back, they can be found here or other places once in a while. I am sure a local rebuild would be doable for cheap, a guy locally would even put a 16:1 worm gear in a box here for half the price of that flaming river unit... check out firmfeel.com for good steering parts and rebuilds to improve handing and stuff.
JOE